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I'm working on Exercise 2.5 in http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-189-a-gentle-introduction-to-programming-using-python-january-iap-2011/assignments/MIT6_189IAP11_hw2.pdf Sadly, my math skills have atrophied. I'm supposed to write a function that computes the roots of a quadratic. I looked it on Wikipedia at http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula But I'm also supposed to check for complex roots. How do I do that? What I have so far at https://gist.github.com/3845296 Also, anyone have test cases with answers?

MIT 6.189 A Gentle Introduction to Programming Using Python (OCW)
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U know the b^2 -4ac bit of the quadratic? If that is less than 0, then the roots are complex.

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